Investigation on Tribological Behavior of Advanced High Strength Steels: Influence of Hot Stamping Process Parameters

Tian, Xiaowei; Zhang, Yisheng; Li, Jian

doi:10.1007/s11249-011-9908-1

Cited by 37 publications

(19 citation statements)

References 21 publications

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“…The selected sliding distance per strip corresponded to 550 mm and it approximately reproduced the sliding distance by 9 strokes with respect to the press hardening experiment. When compared with the sliding distance of 50 mm as obtained in a test performed by Tian et al [11], the long sliding process on each strip as obtained in the present study could overcome the fluctuations with respect to the tribological behaviours in the initial stage of the present test. Following the sliding process on a strip, an automated pick and place system removed the worn strip to a tray and placed a fresh strip in the test position for the next heating-sliding process.…”

Section: The Set-up Of a Tribological Testsupporting

confidence: 68%

“…However, the strip was heated outside the test position, and thus, the actual strip temperature decreased by approximately 100 C during the transferring process. Tian et al [11] reported consistent correlations between the friction and process parameters with respect to temperature and sliding velocity through a hot strip sliding test with varying process parameters. However, the sliding distance in the study was only 0.05 m, and potentially this short sliding distance was unable to achieve stable responses in the tribological system.…”

Section: Resultsmentioning

confidence: 86%

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Development of a Tribological Test Programme Based on Press Hardening Simulations

et al. 2017

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Press hardening is widely utilized to form ultrahigh-strength steels characterized by a high strength-toweight ratio for automotive components. Press hardening processes include heating boron-manganese steels to austenite phase, forming the steels at a high temperature, and cooling the formed blanks until the martensite phase is reached. However, press hardening processes lead to severe contact conditions between the blank and the tools including contact pressure, relative sliding, and high temperatures, which result in tool wear and increased maintenance cost. The contact conditions that occur in the stamping tool are difficult to study on site. Additionally, simplified tests, such as pin on disc and ball on disc, are insufficient to reproduce press hardening conditions in laboratory environments. The aim of this study includes developing a tribological test with press hardening conditions in which tool steel pins continuously slide on fresh and hot boron-manganese steel strips. The test programme mimics press hardening conditions with respect to sliding distance, sliding velocity, contact pressure, and surface temperature that were studied based on finite element (FE) simulations of a press hardening experiment. Furthermore, a FE simulation of the tribological test is established and it provides contact temperature in the pin tip with a high accuracy. A tribological test is used to study friction and mass loss with variational pressures and velocities that represented typically variational contact conditions in the press hardening. The tribological test is also used to obtain correlations between the tribological behaviours and process parameters in press hardening including pressure and sliding velocity.

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Section: The Set-up Of a Tribological Testsupporting

confidence: 68%

Section: Resultsmentioning

confidence: 86%

Development of a Tribological Test Programme Based on Press Hardening Simulations

et al. 2017

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“…The influence of the workpiece temperature and drawing velocity on adhesive wear has been investigated by Tian et al [14] with strip drawing tests. Within this study increasing adhesive wear is caused by increased workpiece temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…This could be due to two reasons. It has been reported that adhesion is a time dependent process [14]. Thus, the increased contact time between workpiece and friction jaw at 30 mm/s leads to a bigger amount of adhesive wear.…”

Section: Influence Of Drawing Velocitymentioning

confidence: 98%

Investigation of the influence of process parameters on adhesive wear under hot stamping conditions

Schwingenschlögl

Weldi

Merklein

2017

J. Phys.: Conf. Ser.

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Abstract. Current challenges like increasing safety standards and reducing fuel consumption motivate lightweight construction in modern car bodies. Besides using lightweight workpiece materials like aluminum, hot stamping has been established as a key technology for producing safety relevant components. Producing hot stamped parts out of ultra-high strength steels offers the possibility to improve the crash performance. At the same time the weight of car structure is reduced by using thinner sheet thicknesses. In order to avoid oxide scale formation and ensure corrosion protection, AlSi coatings are commonly deposited on the sheet surfaces used for direct hot stamping. This workpiece coating has a critical impact on the tribological conditions within the forming process and, as a consequence, influences the quality of hot stamped parts as well as tool wear. AlSi coatings have been identified as major reason for adhesive wear, which represents the main wear mechanism in hot stamping. Within this study, the influence of the process parameters on adhesive wear are investigated in dependency of workpiece and tool temperatures, drawing velocities and contact pressures. The tribological behavior is analyzed based on strip drawing experiments under direct hot stamping conditions. The experiments are performed with AlSi coated 22MnB5 in contact with the hot working tool steel 1.2367. For analyzing the amount of adhesion on the friction jaws, the surfaces are characterized by optical measurements. The experiments indicate that higher workpiece temperatures cause severe adhesive wear on the tool surface, while an increase of drawing velocity or contact pressure led to reduced adhesion. The measured friction coefficients decreased with rising amount of adhesion and remained at a constant level after a certain adhesive layer was built up on the tool surface.

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“…These experiments making use of actual hot stamping tests can effectively describe the tool wear phenomena, but they are costly and time consuming. Some other investigations were performed making use of laboratory testing devices, such as a sliding, reciprocating, and vibrating (SRV) machine [17], a deep drawing process simulator [18], hot strip drawing devices equipped with roller hearth furnace [19], an induction heating system [20], or infrared image furnace [21]. However, these devices are not usually able to accurately reproduce the thermal and mechanical conditions the tools cyclically encounter during the actual hot stamping process.…”

Section: Introductionmentioning

confidence: 99%

Wear in Hot Stamping by Partition Heating

Simonetto

Scagnolari

et al. 2020

JMMP

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Hot stamping by partition heating of Al–Si coated boron steel sheets is currently utilized to produce parts of the car body-in-white with tailored microstructural and mechanical characteristics. This paper investigates the evolution of the Al–Si coating and its tribological and wear performances in the case of direct heating at the process temperatures of 700 °C, 800 °C, and 900 °C, skipping the preliminary austenitization as it may happen in the case of tailored tempered parts production. A specifically designed pin-on-disk configuration was used to reproduce at a laboratory scale the process thermo-mechanical cycle. The results show the morphological and chemical variation of the Al–Si coating with heating temperature, as well as that the friction coefficient, decreases with increased temperature. Furthermore, the results proved that the adhesive wear is the main mechanism at the lower temperature, while abrasive wear plays the major role at the higher temperature.

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Investigation on Tribological Behavior of Advanced High Strength Steels: Influence of Hot Stamping Process Parameters

Cited by 37 publications

References 21 publications

Development of a Tribological Test Programme Based on Press Hardening Simulations

Development of a Tribological Test Programme Based on Press Hardening Simulations

Investigation of the influence of process parameters on adhesive wear under hot stamping conditions

Wear in Hot Stamping by Partition Heating

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